2 minutes to 7/11 6 minutes to tesco lotus and enter bts station from the center. Cross the platform to Century centre and tops supermarket can walk around to big c extra. Lots of little shops and restaurants as well as the usual chain restaurants. About 15 minutes will see you in absolute city centre. Travel from one end of the system to the other for 44 baht. Straight out to mochit to extend your visa at government buildings if needed